ML20151V095
| ML20151V095 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 09/04/1998 |
| From: | PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | |
| Shared Package | |
| ML20151V075 | List: |
| References | |
| NUDOCS 9809140072 | |
| Download: ML20151V095 (5) | |
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ATTACHMENT 1 LIMERICK GENERATING STATION UNITS 1 AND 2 Docket Nos.
50-352 50-353 License Nos.
NPF-39 NPF-85 1
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l
" Deletion of Drywell and Suppression Chamber Purge System Operational Time Limits" Supplement TS Pages 1
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o a
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9009140072 980904 PDR ADOCK 05000352 P
POR
(0NTAINMENT SYSTEMS DRYWELLAND SUPPRESSION CHAMBER PVRGE SYSTEM i
LIMITING CONDITION FOR OPERATION 3.6.1.8 The drywell and suppression chamber purge system may be in operation with the supply and exhaust isolation valves in one supply line and one exhaust line open for inerting, deinerting, pressure control, ALARA or air quality considerations for personnel entry, or Surveillances that require the valves to be open.
. APPLICABILITY:
OPERATIONAL CONDITIONS 1, 2, and 3.
ACTION:
With a drywell and/or suppression chamber purge supply and/or exhaust a.
j isolation valve open, except as permitted above, close the valve (s) within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> or be in at least H0T SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
j SURVEILLANCE REOUIREMENTS 4.6.1.8 At least once per 31 days, verify each primary containment purge j
value [18" or 24"] is closed.*, **
i o Only required to be met in OPERATIONAL CONDITIONS 1, 2 and 3.
N Not required to be met when the primary containment purge valves are open for inerting, deinerting, pressure control, ALARA or air quality considerations for personnel entry, or Surveillances that require these valves to be open.
LIMERICK - UNIT 1 3/4 6-11
CONTAINMENT SYSTEMS BASES i
3/4.6.1.5 PRIMARY CONTAINMENT STRUCTURAL IN1ECRITY This limitation ensures that the structural integrity of the containment will be maintained comparable to the original design standards for the life of the unit.
Structural integrity is required to ensure that the containment will withstand the maximum calculated pressure in the event of a LOCA.
A visual inspection in accordance with the Primary Containment Leakage Rate Testing Program is sufficient to demonstrate this capability.
3/4.6.1.6 DRYWELL AND SUPPRESSION CHAMBER INTERNAL PRESSURE The limitations on drywell and suppression chamber internal pressure ensure that the calculated containment peak pressure does not exceed the design pressure of 55 psig during LOCA conditions or that the external pressure differ-ential does not exceed the design maximum external pressure differential of 5.0 psid.
The limit of - 1.0 to + 2.0 psig for initial containment pressure will limit the total pressure to s 44 psig which is less than the design pressure and is consistent with the safety analysis.
3/4.6.1.7 ORYWELL AVERAGE AIR TEMPERATURE The limitation on drywell average air temperature ensures that the con-tainment peak air temperature does not exceed the design temperature of 340*F during steam line break conditions and is consistent with the safety analysis.
3/4.6.1.8 DRYWELL AND SUPPRESSION CHAMBER PURGE SYSTEM The drywell and suppression chamber purge supply and exhaust isolation valves are required to be closed during plant operation except as required for inerting, deinerting, pressure control, ALARA or air quality considerations for personnel entry, or Surveillances that require the valves to be open.
Limiting the use of the drywell and suppression chamber purge system to specific criteria is imposed to protect the integrity of the SGTS filters. Analysis indicates that should a LOCA occur while this pathway is being utilized, the associated pressure surge through the (18 or 24") purge lines will adversely affect the integrity of SGTS. This condition is not imposed on the 1 and 2 inch valves used for pressure control since a surge through these lines does not threaten the operability of SGTS.
Surveillance requirenent 4.6.1.8 ensures that the primary containment purge valves are closed as required or, if open, open for an allowable reason.
If a purge valve is open in violation of this SR, the valve is considered inoperable.
The SR is modified by a Note stating that primary containment purge valves are only required to be closed in OPERATIONAL CONDITIONS 1, 2 and 3.
The SR is also modified by a Note stating that the SR is not required to be met when the purge valves are open for the stated reasons.
The Note states that these valves may be opened for inerting, deinerting, pressure control, ALARA or air quality considerations for personnel entry, or Surveillances that require the values to be open.
The 18 or 24 inch purge valves are capable of closing in the environment following a LOCA.
Therefore, these valves are allowed to be open for limited periods of time.
The 31 day Frequency is consistent with other PCIV requirements.
LIMERICK - UNIT 1 53 3/4 6-2
CONTAINMENT SYSTEMS ORYWELL AND SUPPREFSION CHAMBER PURGE SYSTEM LIMITING C0NDITION FOR OPERATION 3.6.1.8 The drywell and suppression chamber purge system may be in operation with the supply and exhaust isolation valves in one supply line and one exhaust line open for inerting, deinerting, pressure control, ALARA or air quality considerations for personnel entry, or Surveillances that require the valves to be open.
APPLICABILITY:
OPERATIONAL CONDITIONS 1, 2, and 3.
l l
ACTION:
With a drywell and/or suppression chamber purge supply and/or exhaust a.
isolation valve open, except as permitted above, close the valve (s) within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> l
and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
l SURVEILLANCE RE0VIREMENTS l
4.6.1.8 At least once per 31 days, verify each primary containment purge valve (!S" or 24") is c') sed.*, **
l i
- Only required to be met in OPERATIONAL CONDITIONS 1, 2, and 3.
- 'Not required to be met when the primary containment purge valves are open for inerting, deinerting, pressure control, ALARA or air quality considerations for personnel entry, or Surveillances that require thes'e valves to be open.
LIMERICK - UNIT 2 3/4 6-11 i
CONTAINMENT SYSTEMS BASES 3/4.6.1.5. PRIMARY CONTAINMENT STRUCTURAL INTEGRITY This limitation ensures that the structural integrity of the containment will be maintained comparable to the original design standards for the life of the unit.
Structural integrity is required to ensure that the containment will withstand the maximum calculated pressure in the event of a LOCA. A visual inspection in accordance with the Primary Containment Leakage Rate Testing Program is sufficient to demonstrate this capability.
3/4.6.1.6 DRYWELL AND SUPPRESSION CHAMBER INTERNAL PRESSURE The limitations on drywell and suppression chamber internal pressure ensure that the calculated containment peak pressure does not exceed the design pressure of 55 psig during LOCA conditions or that the external pressure differ-ential does not exceed the design maximum external pressure differential of 5.0 psid.
The limit of - 1.0 to + 2.0 psig for initial containment pressure will limit the total pressure to s 44 psig which is less than the design pressure and is consistent with the safety analysis.
3/4.6.1.7 DRYWELL AVERAGE AIR TEMPERATURE The limitation on drywell average air temperature ensures that the con-tainment peak air temperature does not exceed the design temperature of 340*F during steam line break conditions and is consistent with the safety analysis.
3/4.6.1.8 DRYWELL AND SUPPRESSION CHAMBER PURGE SYSTEM The drywell and suppression chamber purge supply and exhaust isolation valves are required to be closed during plant operation except as required for inerting, deinerting, pressure control, ALARA or air quality considerations for personnel entry, or Surveillances that require the valves to be open.
Limiting the use of the drywell and suppression chamber purge system to specific criteria is imposed to protect the integrity of the SGTS filters. Analysis indicates that should a LOCA occur while this pathway is being utilized, the associated pressure surge through the (18 or 24") purge lines will adversely affect the integrity of SGTS.
This condition is not imposed on the 1 and 2 inch valves used for pressure control since a surge through these lines does not threaten the operability of SGTS.
Surveillance requirement 4.6.1.8 ensures that the primary containment purge valves are closed as required or, if open, open for an allowable reason.
If a purge valve is open in violation of this SR, the valve is considered inoperable.
The SR is modified by a Note stating that primary containment purge valves are only required to be closed in OPERATIONAL CONDITIONS 1, 2 and 3.
The SR is also modified by a Note stating that the SR is not required to be met when the purge valves are open for the stated reasons.
The Note states that these valves may be opened for inerting, deinerting, pressure control, ALARA or air quality considerations for personnel entry, or Surveillances that require the valves to be open.
The 18 or 24 inch purge valves are capable of closing in the environment following a LOCA. Therefore, these valves are allowed to be open for limited periods of time. The 31 day Frequency is consistent with other PCIV requirements.
LIMERICK - UNIT 2 B 3/4 6-2